Variable-temperature circular treatment method of ultrafine C250 maraging steel grains

A maraging steel and variable temperature cycle technology, applied in the field of metal heat treatment, can solve the problems of limited grain refinement effect of solid solution treatment, affecting material application and unsatisfactory effect, etc., achieving small grain size and improving strength and toughness. , the use of good effect

Inactive Publication Date: 2013-03-20
GUIZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional means of grain refinement mainly include solid solution treatment and deformation treatment to refine grains, etc. The deformation treatment process is easy to produce texture, which makes its performance directional and affects the application of materials in high-tech products; However, the effect of simple solution treatment on grain refinement is limited, and it is difficult to meet the requirements of modern equipment.
Therefore, the effect of the existing C250 maraging steel grain refinement treatment method is still not ideal

Method used

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  • Variable-temperature circular treatment method of ultrafine C250 maraging steel grains
  • Variable-temperature circular treatment method of ultrafine C250 maraging steel grains

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0008] Example 1 of the present invention: a variable temperature cycle treatment method for superfine C250 maraging steel grains, heating C250 maraging steel to 750°C, keeping it warm for 5 minutes, and then water-cooling and quenching to room temperature to achieve the first Secondary cycle treatment: heat the material that has undergone the first cycle treatment to 930°C and keep it warm for 5 minutes, then water-cool and quench to room temperature to realize the second cycle treatment; through the above two variable temperature cycle treatments, C250 Martens grain refinement and homogenization of bulk aging steel.

Embodiment 2

[0009] Example 2 of the present invention: a variable temperature cycle treatment method for superfine C250 maraging steel grains, heating C250 maraging steel to 700°C, keeping it warm for 10 minutes, and then water cooling and quenching to room temperature to achieve the first Secondary cycle treatment: heat the material that has undergone the first cycle treatment to 960°C, keep it warm for 1 minute, and then water-cool and quench it to room temperature to realize the second cycle treatment; through the above two variable temperature cycle treatments, C250 Martens grain refinement and homogenization of bulk aging steel.

Embodiment 3

[0010] Example 3 of the present invention: a variable temperature cycle treatment method for superfine C250 maraging steel grains, heating C250 maraging steel to 780°C, keeping it warm for 1 minute, and then water cooling and quenching to room temperature to achieve the first Secondary cycle treatment: heat the material that has undergone the first cycle treatment to 900°C and keep it warm for 10 minutes, then water-cool and quench to room temperature to realize the second cycle treatment; through the above two variable temperature cycle treatments, C250 Martens grain refinement and homogenization of bulk aging steel.

[0011] In order to further verify the experimental effect of the present invention, the metallographic structure of the C250 maraging steel processed by the present invention is compared with the C250 maraging steel of the traditional deformation treatment, and the C250 maraging steel processed by the present invention is The metallographic structure of aging s...

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Abstract

The invention discloses a variable-temperature circular treatment method of ultrafine C250 maraging steel grains, which comprises the following steps: heating C250 maraging steel to 700-780 DEG C, keeping the temperature for 1-10 minutes, and carrying out water quenching to room temperature, thereby implementing primary circular treatment; and heating the material subjected to primary circular treatment to 900-960 DEG C, keeping the temperature for 1-10 minutes, and carrying out water quenching to room temperature, thereby implementing secondary circular treatment. The variable-temperature circular treatment twice simultaneously implements refinement and homogenization of the C250 maraging steel grains. By utilizing the characteristic of phase-change cold hardening recrystallization in the reverse change process from martensitic structure to austenite by heating, the variable-temperature circular treatment twice effectively and sufficiently refines and homogenizes the austenite grains without plastic deformation. The invention can effectively enhance the toughness and fatigue life of the part.

Description

technical field [0001] The invention relates to the technical field of metal heat treatment, in particular to a variable temperature cycle treatment method for superfine C250 maraging steel grains. Background technique [0002] With the rapid development of my country's machinery industry, especially the aviation and aerospace industries, there are higher requirements for high-strength materials. Due to its excellent combination of strength and toughness, C250 maraging steel has received great attention from material workers in various countries, and has broad development prospects. Its further development, development and application are imperative. Among them, grain refinement strengthening is the main means to improve the strength, plasticity and toughness of maraging steel. The traditional means of grain refinement mainly include solid solution treatment and deformation treatment to refine grains, etc. The deformation treatment process is easy to produce texture, which ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C21D1/78
Inventor 赵飞时雨梁益龙梁宇
Owner GUIZHOU UNIV
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